Improvement in thrashing-machines



J. ALLONAS. T hrashing lVIaJohine.A

No. 109,482. Patented Nov. 22, 1870.

about tttata identit ttifite.

Letters Patent No. 109,482, dated November 22, 1870.

IMPROVEMENT IN THRAS`HING-MACHINES.

The Schedule referred to in these Letters Patent and making part of thesame.

To -all whom it may con-cern p Be itknown that I, JOSEPH ALLoNAs, ofMansfield, county'of Richland and State of Ohio, have invented certainnew and useful Improvements in rlhrashing- Machines, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying drawing making a part of this specification, inwhich- Figure 1 is a perspectiveview of my improvement. Figure 2 is avertical transverse section, showing, in dotted lines, tho relativeposition of the thrashing-cylinder and the teeth of the concave.v

Figure 3 is a detached view, showing the manner of attaching the teethto the concave.

The invention consists in- First, combining with. a reticulaled orperforated concave triangular teeth, having their upper or working-edgeshollowed out or concaved, and their. sides ribbed or roughened.

Second, in providing the groo'vcd sector-pieces, which support thesections of concave, with radial ribs o1 spurs, whereby theyarc made toassist in thc separal tion of thc grain; and

Instead of ribs b', spurs may be employed, or any other means ofroughening the surface of these plates,

without departing from the spirit of my invention.

Plate B may be adj ustably secured to frame A Al A2, in any desiredmanner, there being, of course, one plate at each end of the concave.

C is a section o f the concave.

It .is perforated or reticulated, as 'shown in the drawing, and groovedtransversely for the reception of 'thelower edges ofthe teeth D.

. 11.', substantially as described.

These teeth are triangular in form, being convex upon their lower edge,as is plainly shown in iig. 3, in order to lit accurately the upper faceof the section C,

'and concave upon their upper edge, for a purpose Ifacilitating theseparation ofthe grain from thc-straw.

In operating my thrasher, the cylinder (represented by dotted lines intig. 2) is driven rapidly in the direction indicated by the arrow inthis vligure. As the straw is drawn in, it at lirst moves easily overthc upperedges of the teeth, the gradual risc of the curves offering butlittlel resistance to the advancing straw, until it (the straw) reachesthe rear end of the tooth, when it is suddenly driven down between -thcmwith a sharp blow.

lAs thrashers are ordinarily constructed, ymore Vor less grain will slipthrough between the outer row of cylluder-teeth andthe inclosing-franieor sides, without being properly thrashed, and, in order to remedy thisdilliculty, I form the ribs b upon sector-plates B.

Having now described lnyv invention,

y What I claim as new, and desire to securcbyl. The combination ot" Vthercticnlated concave section Gand the triangular teeth D having theirupper or working-edges made concave in form, substantially as described.

2. The combination oi' the grooved concave section C, thc teeth I),provided with flanges d, and the bolts JOSEPH ALLONAS.

Witnesses l Joan MYERS, H. D. KEITH.

